aptly: remove gopath

[chenrui333]

• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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Remove gopath as formula has moved to go modules.

Relates to #47627

[chenrui333]

I will need to work a little bit on this offline.

[alebcay]

This will also address an entry in #45514 once this is merged.

[chenrui333]

Cool, thanks for the cross-reference!